Centrifugal pump.



E. F. ENTWISLE.

CENTRIFUGAL PUMP.

APPLICATION FILED MAY 21, 1913. A mwmm Patented Jan. 2,1917.

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CENTRIFUGAL PUMP. APPucAnoN ruin MAY21.I9I&

Patented Jan. 2,1917

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EDWARD F. ENTWISLE, OF DUQUESNE, PENNSYLVANIA, ASSIGNOR TO HENRY R.'WORTHINGTON, A CORPORATION OF NEW JERSEY.

CENTRIFUGAL PUMP.

emma.

.to' the construction of single stage pumps of the glass illustrated inthe drawings.

In all centrifugal pump constructions with which I am familiar the waterinlet passages terminate at their inner end or ends discharging into thepump impeller chamber in an annular space formed around the axis of theimpeller shaft, the shaft ex tending lengthwise through such space intoshaft bearings on the exterior of the pump casing. When the pump isconstructed in such manner, rotative currents are formed or set upwithin the annular space at the discharge end of the inlet passages byreason of the rotation of the water in the impeller. These currents actto impede the flow of water from the inlet passages into the interior ofthe pump casing which forms the pumping chamber in which the rotaryimpeller of the pump is located.

In centrifugal pump constructions of that class in which the inletpassage enters the suction chamber transversely to the impeller shaft,as in the well known pumps in which the impeller takes its suctionhorizontally from a suction passage below the center line of the pump, adifficulty arises from the fact that the water in the suction chamber inflowing around the impeller suction is given a direction tending tocarry it back through the suction chamber into the suction passage, thisresulting in counter currents and eddies, and reducing the capacity andefliciency of the pump. I have discovered that by providing meanswhereby the formation is prevented of such rotative currents around thepump shaft within the annular space forming the discharge end of thestationary water inlet passages of the pumps that the pumping capacityand the eificiency of the pumps are very materially increased. I alsopreferably avoid the tendency to rotation of the water in the suctionchamber by inclosing the impeller shaft within a fixed casing up to theentrance of the impeller so that there is no exposed ro- Specificationof Letters Patent.

Patented Jan. 12, 1917.

Application filed May 21, 1913. Serial No. 769,027.

tating shaft in the suction chamber tending to cause rotation orwhirling motion of the fluid.

One object of my invention in its most complete form is to provide acentrifugal pump having novel means whereby the creation of rotativecurrents about the pump shaft in the discharge end of the water inletpassages to the pump adjacent to the point of junction of the inletpassages with the impeller chamber of the pump casing is made absolutelyimpossible, such currents are totally eliminated, and the water iscaused to enter the impeller chamber in'a path parallel with the axis ofthe pump shaft.

-Referring to the accompanying drawings, forming part of thisspecification, Figure 1 is a side elevation showing a centrifugal pumpconstructed and arranged in accordance with my invention. Fig. 2 is atransverse sectional elevation of the same taken on the line IIII ofFig. 1. Fig. 3 is a sectional plan on the line IIIIII of Fig. 1. Fig. 4is a side elevation similar to Fig. 1, partly in section, the-sectionbeing taken on the line IVIV of Fig. 5, showing a modified form of pumpconstructed in accordance with my invention. transverse section taken onthe irregular line VV of Fig. 4. Fig. 6 is a similar transverse sectiontaken on the irregular line VI-VI of Fig. 4.

In the drawings the numeral 2 designates the top and 3 the bottomsection of a centrifugal pump casing,'the casing having a water inlet 4and discharge outlet 5. The pump has a shaft 6 on which the pumpimpeller 7 is mounted to rotate therewith, the impeller 7 beingpositioned within the impeller chamber 8 formed in the pump casing, andthe shaft being journaled in laterally extending hubs 19, 19, formed onsaid pump casing;

As will be seen by reference to Figs. 1, 2 and 3, the water inlet 4 isdivided or forked so as to form passages 9, 9 one on each side of thepartitions 10 in the casing, the partitions 1O separating the waterinlet passages 9, 9 from the impeller chamber 8.

Fig. 5 is a.

and central discharge passage 11 which conmeets the chamber 8 with thewater discharge outlet 5. The suction inlets 9, 9 ex-. tend upwardlyabove the axial center of the horizontal impeller shaft 6 so as to pro--side of the partitions 10 into the spaces at.

vide a space 12 around the shaft 6 on each side of the pump casing, thespace 12 around the impeller shaft 6 and hub casing 19 and opening intothe impeller chamber 8. The impeller 7 is mounted upon the shaft 6 andis provided with vanes 13 of the usual construction, and not formingpart of this invention is not further described.

In constructing pumps in accordance with my invention, ribs ordiaphragms 14; and 15 or a series of such ribs are provided within thespace 12 which are positioned to extend radially, as is clearly shownin" Fig. 2, so as to form bafiles which break up or effectually preventany rotative currents being formed within the space 9 at the dis chargeend of the water inlet passages adjacent to the junctionof these inletpassages with the impeller chamber 8 within the pump casing. I havediscovered'that by providing means such as the ribs 14, 15 forpreventing the formation of rotative currents in this or like manner inpumps where the inlet passages open into the impeller chamber thecapacity of a pump of given size willbe very largely increased, as wellas materially increasing the efiiciency of the pump. In the constructionshown in Figs. 4, 5 and 6 the same result is obtained by modifying theconstruction of the discharge ends 16 of the inlet passages 17, 17 as isclearlyshown in these figures, this modification comprising theformation of the septem or partition 18 within the annular space in theinlet passages at the discharge end or point of junction of the inletpassages with the impeller chamber 8 of the pump, said partition 18,extending backwardly from the end wall of the inlet conduit to the hub"casing 19. I

In the operation of centrifugal pumps constructed in accordance with myinvention, the water or other fluid being pumped enters the pump inlet 4and passes upwardly in the passages 9 located. on each the discharge endof the inlet passages adjacent to the junction of these passages withthe impeller chamber.

The ribs or vanes 14 and 15, in the construction of Figs. 1, 2 and 3 andthe rib 18 in the construction of Figs. 4, 5 and 6 en tirely preventsthe creation of rotative currents. within the space at the inlet end ofthe suction passages and causes the water to flow in a path parallelwith the axis of the rotating impeller shaft into the impeller chamber,instead of churnin or rotating about. the axis of the shaft wit in thespaces 12 at the discharge end of the inlet passages.

The advantages ofmy invention will be I .appreciated by those skilled inthe art, as

actual tests show that by simply preventing the creation of all rotativecurrents at the discharge end of the inlet passages of the to travelalong lines substantially parallel with the axis of the impeller at themoment it enters the impeller. e

2. K centrifugal pump comprising in combination, a casing, a rotaryimpeller mounted therein, aninlet conduit for said casing terminating inan annular chamber substantially concentric with said rotary impeller,and means located in said annular chamber for compelling the infiowingfluid to travel therethrough along lines substan-- tially parallel withthe axis of the impeller,

said means including at least one partition.

located in said annular chamber, and extending entirely across the samein a plane substantially parallel to said axis.

' 3. A centrifugal pump comprising in com- ..bination, a casing formin asubstantially circular chamber, an impel er in said chamber mounted on ashaft whose axis coin- 'cides with the axis of the chamber, means fordelivering a supply of fluid to the impeller in said chamber around theshaft of V the impeller, and means for compelling sald fluidto travel inplanes substantially parallel with the axis of said shaft, at the momentof its entry into said impeller.

4. A centrifugal pump comprising in com- -bination, a casing havinga'circularpump chamber therein with'the usual side inlet at the center,and an impeller journaled in sa d casing and adapted to rotate in saldchamher, an inlet conduit connected to said inlet opening in the casing,and means for compelling the incoming fluid to travel in a directionsubstantially perpendicular to the plane of rotation of the impeller atthe moment of its entry into thelmpeller.

5. A centrifugal pump having an impeller chamber, an annular lnletchamber surrounding the axis of the impeller chamber at one side of saidimpeller chamber and communicating laterally therewith, an inlet passagecommunicating with the an nular inlet chamber, and means in said annular chamber to prevent rotation of the inlet water in said inletchamber wh ch would otherwise be caused by the rotation of the water inthe impeller. r

-6. A centrifugal pump having an impeller chamber, an annular inletchamber surrounding the axis of the impeller chamber at one side of saidimpeller chamber and communicating laterally therewith, an inlet passagecommunicating with the annular in let chamber, and means in said annularinlet chamber to direct the Water discharging therefrom into theimpeller chamber in a direction substantially parallel with the axis ofthe impeller chamber.

7. A. centrifugal pump having an impeller chamber, an annular inletchamber surrounding the axis of the impeller chamber at one side of saidimpeller chamber and communicating laterally therewith, an inlet passagecommunicating with the annular inlet chamber, and means in said annularinlet chamber to prevent rotation of the inlet water in said chamber,which would otherwise be caused by the rotation of the water in theimpeller, and also to direct the water discharging from the inletchamber to the impeller chamber in a direction substantially parallelwith the axis of said impeller chamber.

8. A centrifugal pump having an impeller chamber, an annular inletchamber surrounding the axis of the impeller chamber at one side of saidimpeller chamber and communicating laterally therewith, an inlet passagecommunicating with 'theannular inlet chamber, and means in said annularinlet chamber to prevent rotation of the inlet water in said chamber,which/would otherwise be caused by the-rotation of the water in theimpeller, and also to direct the Water from the inlet chztmber to theimpeller chamber in a direction substantially parallel with the axis ofsaid impeller chamber, consisting of a partition occupying substantiallythe entire cross-sectional area of the inlet chamber at one side of theshaft opening therethrough and disposed substantially radial withrespect to the axis of said chamber. I

9. A centrifugal pump comprising in combination, a casing, a rotaryimpeller mounted therein and provided with an axially disposed suctioninlet, an inlet conduit for said casing terminating in a suction chamberwhich surrounds and extends to the inlet of the impeller, a shaft onwhich said impeller is ,mounted, a hub member inclosing the shaft andforming a bearing therefor which extends from the casing through thesuction chamber substantially to the inlet of the impeller and one ormore :versely to vanes extending from the hub member to the walls of thesuction chamber and to the inlet of the impeller whereby the flow .is

ing an impeller with a horizontal suction entrance, a suction chambersurrounding the suction entrance of the impeller, a suction' passageentering the suction chamber transversely to the impeller shaft, one ormore vanes in the suction chamber arranged to direct the flow about thesuction entrance of the impeller and to separate the flow about thesuction entrance from the incoming flow through the suction passage,whereby counter currents are avoided and the flow distributed throughoutthe impeller suction, and a fixed casing inclosing the pump shaftthroughout the suction chamber in which the inner ends of said vanesterminate.

11. In a centrifugal or turbine pump having an impeller witha-horizontal suction entrance, a suction chamber surrounding the suctionentrance of the impeller, a suction passage entering the suction chambertransthe impeller shaft, and one or more vanes in the suction chamberarranged to direct the flow about the suction entrance of the impellerand to separate the flow about the suction entrance from the incomingflow through the suction passage, whereby counter currents are avoidedand the flow distributed throughout the impeller suction.

12. A centrifugal or turbine pump having an impeller with a horizontalsuction entrance, a suction chamber surrounding the suction entrance ofthe impeller, a suction passage entering the suction chambertransversely to the impeller shaft, and one or more vanes in the suctionchamber and extending from the inner wall to'zthe outer Wall ofthesuction chamber and arranged to direct the flow about the suctionentrance of the impeller and to separate the flow about the suctionentrance from the incomingflow through the suction passage, wherebycounter currents are avoided and ,the flow distributed throughout theimpeller suction.

In testimony whereof, I have hereunto set my hand.

EDWARD F. ENTWISLE.

Witnesses CHARLES McK. Moons, GEO. L. Nnrr.

